the project requires uploading apk files. I did format verification before uploading. Google saw that when uploading files were apk, the type was application/vnd.android.package-archive, and then I used this one. Later, other people found that the verification failed with the browser of ie, Sogou and so on. I tried it with Firefox and found that the type of Firefox printing and uploading files was empty, but if it was a picture, it could display image/png and so on. Is it necessary to judge the browser kernel and so on
before uploading?